I think I've got to the point where it's not embarrassingly bad. Just not good. A lot of things aren't quite working how I'd like them to. I find second opinions help with this sort of thing.

My major concern is that I'm too long winded and a bit all over the place thematically. Also matching a particular style always takes a bit of getting used to. So nothing quite scans like I'd like it to.

Note: I correct the given mistake only once. If you do not use the metric system, I will only make a single comment about it, even if it appears again in the rest of the article. If the draft has many language problems, I will only correct the most glaring ones.

SCP-3000 can be stored in any high-security humanoid containment wing.

I recommend rephrasing, because the wing includes outside of cells, and the 'can be' part implies that it's not actually contained right now.

A staff member is to be sent into the containment wing once a day. They are to ensure that SCP-3000 performs forty minutes of light exercise. Following this, they are to inspect SCP-3000's coat for matted hair or overgrowing nails. These should be removed appropriately.

I usually say that people should avoid making sentences too long, but I recommend the opposite here. It's a bit too choppy here:

''SCP-3000 is required to perform 40 minutes of light exercise daily. Following this, its coat and fur will be inspected for matted hair or overgrowing nails and removed appropriately when found.''

Why are we checking for overgrown nails daily anyway? We can probably assume that its nails haven't overgrown in the previous 24 hours.

SCP-3000's diet is to be controlled.

That's to be expected, right? We won't allow it to forage itself.

These are typically available in the form of beet pulp or flaxseed but may differ from site to site.

However, the subject's face and head have undergone significant surgical alterations. The creature's eyes, teeth and jaw bones have been removed and replaced with that of a human.

Don't say 'the creature' or 'the subject'. Designate it 'SCP-XXXX' or 'it'. This is true for the whole draft.

The most common communication from the creature consists of requests for food or complaints of hunger. While the creature claims not to feel hungry,

It literally says that it's hungry in the first sentence, but that it claims it isn't in the next.

This indicates that these feelings of hunger are significant enough to countermand feelings of shame, disgust or pain.

I mean, I've seen dogs eat stranger things. People eat ice cubes too. Some people even eat wood, but that's the strangest thing of the three.

Furthermore, it claimed knowledge of a personal issue in Agent [Data Expunged] that the inquiry had previously found used as a means of extorting Agent [Data Expunged].

I'm going to recommend reading Zen And The Art Of DATA EXPUNGED, because this looks removed for the wrong reasons. Censoring on the site is used as a narrative device. It makes the reader wonder what was horrible enough to be removed like that. That is, if you give them the right clues. If you remove it without proper context or hints to what something might mean, it instead looks like you didn't know what to write here.

Fluff text, a lot of it. There's so much information that can be removed without taking any relevant information away and it makes this very distracting while reading. What also contributes to this feeling are the short, choppy sentences I mentioned before. Clinical tone doesn't mean completely deadpan, it means using efficient language without emotional charge.

On the creature itself: I'm not very familiar with the Proto-Sarkic GoI, but I do know that they're technophobic which begs the question: If this is a creation of said cult, how is it even remotely possible that they're capable of a surgery this complex?

Moreover, it seems to borrow its intrigue from the GoI heavily, which is fine if it's good even without the GoI involvement. Take the Sarkicism away from it though, and it turns into a monster fusion with no real context, intrigue and narrative arc on its own.

So, rather than writing an object like an encyclopedia entry for its own sake, think of the story that you're telling with the document. Give the reader a sense of immersion, of what happened when recovering and containing it. Give them a taste of what happened behind the procedures, if you will. Make them emotionally invested as they read and continue reading. Give your reader a reason to think about the bigger picture, what's going on behind the scenes.

I'm going to go ahead and have a go at another iteration. I think I've got a pretty good idea of what I should look into.

I'm definitely struggling with getting a clinical tone right. My sentences end up running away or looking cut in half. I've read through the guide on the site but I'd appreciate any suggestions for other good examples.